1 Sachs et. al. IEEE Trans. Nuclear Science NS-31, 1249 (1984) Threshold Shift vs Gate Oxide Thickness Hole removal process by tunneling in thin-oxide MOS Structures Book. Timothy R Oldham “Ionizing Radiation Effects in MOS Oxides” 1999 World Scientific Si SiO 2 e--e-- e -- Poly- Si Gate Tunneling Region Dosage = 150 Krads

2 Company Device Oxide Thickness nm Dose before Damage seen Observation Damage Mode IHPA ASIC custom553 Mradslight damage XYSemi FET 2 amps752 MradMinimal damage XYSemiXP krad Loss of output voltage regulation TI TPS kradabrupt failure IntersilISL 8502unknown40.6 krad Increasing input current IRIR3822unknown139 krads Increasing input current IRIR38419 & 2513 krads Loss of output voltage regulation STST1510unknown125 krad Loss of output voltage regulation EnpirionEN krad Increasing input current, EnpirionEN krads Loss of output voltage regulation Enpirion EN5360 #25100 MradsMinimal damage Enpirion EN5360 #3548 MradsMinimal damage

3 Found out at Power Technology conference 0.25 µm Lithography  Irradiated Stopped on St. Valentines Day 2007  We TWEPP IHP was foundry for EN5360 Enpirion EN5360 With Integrated Inductor

4 Twepp Nagos

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7 For Purchasing EN5360: Steve Robb (908) Tom Howell (908) Is there a Commercial product available ? Yes = It is the EN5360  Satellite folks are using it now  sLHC Levels – 100 Mrads  Use for voltage ratio = 4  Work at Super LHC levels for Tracker  5.5 V in > 1.3 out  Enpirion is still supplying these to a very large customer  IHP foundry will make it for many years.  Can purchase in Die form for use with Air coil

8 Power Supply VInput 5.5 V max to prevent damage. GND Buck Regulator Eval Board Size = 3 inch x 3.5 inch Banana Jacks / Solder Wires Satish Dhawan, Yale University Load Resistor = 0.3 to 1.5 Ώ Line Drop ~ amps in each Leg ??? Twisted Pair Preferred V Input Monitor. 2 Wire Differential V Output Monitor 2 wire Differential Agilent 34970A & Multiplexer 33901A to Monitor I & V April DC-DC Regulator Setup for Radiation Exposure GND V Output = 1.5 V. 1 to 5 Amps. ~ 0.5 Amps. V out > 5 – 20 Volts 4 Wire Current shunt V Output Monitor 2 wire Differential 4 Wire Current shunt V Output Monitor 2 wire Differential DC-DC Converter Voltage ratio = 8/10 Load: Rated Current or maximum without cooling ~ 1 amp Setup for 4 EVAL Boards Measure Bias Current with Load disconnected Solder all wires ???? Switch on/off